Fem Hrothgar arms have a seam and are polygon shaped when they raise their arms, no doubt because the designers made their shoulders unnaturally large & didn't take a second to smooth out the edges or fix the shoulder proportions....

I posted this issue in the bugs forum, hopefully the shoulder shape will be finally adjusted and the edges smoothed.
https://forum.square-enix.com/ffxiv/...87#post6474987

Screens of glaring issue.